Everyone who reads HeliHub.com news will know what Heli-Expo is.  HAI has in the past released an Apple iOS app for the Convention and this year is no different.  The description from the Apple iTunes is:-

HAI is the professional trade association for the international helicopter community. Its 1,800-plus-member organiza­tions and 1,900 individual members, in 74 nations, operate more than 5,000 helicopters approxi­mately 2.3 million hours each year. HAI is dedicated to the promotion of the helicopter as a safe method of commerce and to the advancement of the international helicopter industry.

HAI’s flagship event, HELI-EXPO®, is the world’s largest helicopter exposition and trade show. More than 20,000 attendees from around the world gather each year to look over the latest in vertical-lift manufacturing, equipment, and avionics, and to network with industry peers, suppliers, and vendors.

Requires iOS 5.1 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.